Multiple-spindle drill-chuck.



' PATENTED OCT. 3, 1905.

N. W. ORANDALL. MULTIPLE SPINDLE DRILL CHUCK.

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UNITED STATES earner errion.

NATHAN 1V. CRANDALL, OF HARTFORD, CONNECTICUT, ASSIGNOR TO WILLIAM R.WOOD, OF MERIDEN, CONNECTICUT.

IVIULTIPLE-SPINDLE DRILL-CHUCK.

Specification of Letters Patent.

Patented Oct. 3, 1905.

Application filed April 13, 1905. $erial No. 255,343.

To (all whom, it may concern:

Be it known that I, NATHAN 1V. CRANDALL, a citizen of the United States,residing at Hartford, in the county of Hartford and State ofConnecticut, haveinvented certain new and useful Improvements inMultiple Spindle Drill-Chucks; and I do declare the following to be afull, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame, reference being had to the accompanying drawings, and to thefigures of reference marked thereon, which form a part of thisspecification.

This invention relates to an improvement in drill-chucks, and is closelyallied to that class in which a plurality of spindles are employed andwhich are commonly termed multiplespindle drill-chucks.

The object of this invention is to produce a device which can be readilyattached to the ordinary single spindle drillingmachines, therebyconverting into a multiple -spindle drilling-machine, thus greatlyincreasing its capacity.

Further objects are to produce a device which will be compact in form,cheap to manufacture, and efficient in its operation.

My improved drill-chuck will be readily understood from the followingdescription in connection with the accompanying drawings, in whiclFigure 1 is a view in longitudinal section, the several spindles andcrank-arms being shown in elevation, the section being taken on line A Aof Fig. 2. Fig. 2 is a plan View of the device shown in Fig. 1. Figs. 3and at are respectively a plan and elevation of the compression-sleeveemployed to hold the drills or other implements centrally and firmly inthe spindles of the chuck. Figs. 5 and 6 are a plan view and elevation,respectively, of theintermediate sleeve. Figs. 7 and 8 are respectivelya plan and a view in longitudinal section of the clamping-sleeve. Figs.9'and 10 are respectively a plan and a view in cross-section of thewrist-plate. Figs. 11 and 12 are a plan and a cross-section of one ofthe hardenedsteel washers employed in the antifrictionbearing of thewrist-plate. Figs. 13 and 14 are a plan and cross-section of one of thehardened-steel washers employed in the antifrietion-bearings of theintermediate sleeves. Figs. 15 and 16 are respectively a plan andelevation of one of the crank arms, of which any number required may beemployed. Figs. 17 and 18 are a plan and cross-section of thehardened-steel check-nuts, which act as a thrust-bearing for the body ofthe chuck.

Similar characters denote like parts throughout the entire views.

1 is the cylindrical case of the chuck-body.

2 is the upper, and 3 the lower, head of the chuck-body.

4: is the driving-spindle, and 5 the driving' disk, which may be formedintegral with the spindle or secured thereto in any well-known andapproved manner.

6 is the wrist-plate, which is journaled in the driving-disk.

7 is one of the hardened-steel washers which encircle the wrist-plateand which. with the hardened-steel balls 8, combine to form athrust-bearing for the wrist-plate in a manner which is so common thatfurther description is thought to be unnecessary.

9 represents the crank-arms, of which any number may be employed. Theupper ends of the crank-arms are journaled in the wristplate, and thelower ends thereof are journaled in the lower head of the chuck-body.The body portions of the crank-arms are inclined to their bearingportions in order that they may pass over each other Withoutinterference when rotating. The sleeves 10 (which I term theintermediate sleeves) are threaded onto the lower ends of the crank-armsand take revoluble hearings in the lower head, as shown at 11. Theintermediate sleeves are provided with thrust-bearings 12 by insertingwashers l3 and the balls 14 between their top ends and the shoulders 15in the lower head between the spindlebearings and the intermediatesleeve-bearings. The intermediate sleeve is hardened to produce ahardcontactsurface for the balls 1st. It is also recessed in its lower endto form a seat for one end of the compression-sleeve 16. Thecompressionsleeves 16 are slotted longitudinally from each end, so as toproduce a more perfect clamping action when compressed upon the shanksof the drills or other tools which it may be desired to use.

17. represents the clamping-sleeves, which are recessed to receive thecompression-sleeves 16 and are also threaded onto the lower ends of theintermediate sleeves 10. The ends of the compression-sleeves are beveledand take seat in both the intermediate sleeves and the clamping-sleeves.The clam pingsleeves are also correspondingly beveled, and, as will beseen, when the clamping-sleeves are screwed upon the intermediatesleeves the action of the beveled seats upon the ends of thecompression-sleeves will be such as to cause a clamping action upon anytools placed within the bores 18 of the compression-sleeves 16.

Hardened nuts 19 are screw-threaded upon the driving-spindle and, withthe washers 20 and the balls 21 and the cup 22, compose an antifrictionthrust-bearing for the body of the chuck. The cup 22 is screw-threadedonto the upper end of the upper head of the body portion of the chuck,and a check-nut 23 is provided, by the clamping action of whichaecidental displacement is obviated.

A stem 24: is secured to the body portion of the chuck in any well-knownand approved manner, preferably by being screw-threaded into thecylindrical portion of the case, as shown, for the purpose of abuttingagainst some stationary portion of the machine in which it is used toprevent the said case from rotating.

Suitable oil-holes 25 are provided in the different stationary parts tofacilitate proper lubrication of the rotating parts.

To assemble the device, the procedure is as follows: The spindle 4 ispassed up through the upper head 2, and the parts which constitute themain thrust-bearing are then assembled and secured in place by the cup22, being held in place by the check-nut 23. The cylindrical portion ofthe case is next secured in place by the screw 26. The wrist-plate andits antifriction-bearing is next located in place. Next the crankarmsare passed through the lower head and the intermediate sleeves screwedupon their lower ends. The upper ends of the crank-arms are thenjournaled in the wrist-plate, and at the same time the lower head isintroduced into the open end of the cylindrical portion of the case andis secured therein by the screw 27. The compressionsleeves arenextplaced in the cupped end of the intermediate sleeves and theclamping-sleeves passed over them and engaged with the threaded portionsof the intermediate sleeves, and thereby holding the compression sleevesloosely between the two aforesaid sleeves.

It is obvious that if implements or tools are placed in the bores of thecompressionsleeves when in the conditions described above and theclamping-sleeves screwed home the beveled portions of theclamping-sleeves and the intermediate sleeves acting on the beveledportions of the compression-sleeves will cause them to contract upon theshanks of said tools and hold them firmly in place.

To operate the device, it is coupled to the rotating spindle of anysuitable machine, and the stem 24: is abutted against some stationaryportion of the machine, so as to prevent the body portion of the chuckfrom rotating, when it Will be found that the several tools will berevolved at the same speed as the driving-spindle of the machine towhich it is coupled, so that when a piece of work is brought against theworking points of the tools they will all be operating simultaneously.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is

The combination with a holder having suitably-spaced heads connected bya casing, of a driving-spindle passing through one of the heads, adriving-disk within the casing secured to the spindle; said driving-diskhaving an eccentric aperture, a wrist-plate journaled in the aperture ofthe driving-disk, a plurality of crank-arms journaled at one end withinthe wrist-plate and at the opposite ends in the other head and providedwith drill-holding means, and means secured to the casing to hold thesame against rotation.

In testimony whereof I aflix my signature in presence of two witnesses.I

NATHAN V. CRANDALL.

WVitnesses:

IRvINo J. AVERY, S. FRANK Fox.

